KY Peer Libraries (Shared Google spreadsheet with more data):
Breckinridge County
Grayson County
Grant County
Ohio County
Bell County

IMLS Libraries

|| GLADWIN COUNTY DISTRICT LIBRARY, MI ||

SHIAWASSEE DISTRICT LIBRARY, MI

DEER PARK PUBLIC LIBRARY, TX

OTTUMWA PUBLIC LIBRARY, IA

MARSHALLTOWN PUBLIC LIBRARY, IA

Hall of Famers with Similar populations
BARRINGTON PUBLIC LIBRARY DISTRICT illinois 42,127 pop
RINGWOOD PUBLIC LIBRARY New Jersey 12.3k pop (not a typo)
SOMERS LIBRARY New York 18k pop (not a typo)
THOMAS FORD MEMORIAL LIBRARY 12k pop (not a typo)

Scholarly research on measurements used to determine peer libraries:

HAPLR vs. LJ Rating Systems from Wyoming State Library

Davis, D. M. (2008). A comparison of public library data: PLDS in context. Public Libraries, 47(5), 20-25.

Hennen, T. J., Jr. (2010). HAPLR scores rank input, output. American Libraries, 41, (6/7), 22.

Lance, K., & Lyons, R. (2008). The New “LJ” Index. Library Journal (1976), 133(11), 38-41.

Lyons, R. & Neal, K. (2008). Honorable mention: What public library national ratings say. Public Libraries, 47(6), 36-43.

Link to the list: Peer Libraries by Population and Expenditures

Sources for comparison to peer libraries:

Kentucky Department of Libraries and Archives survey data
HAPLR ratings (used by sample paper)

Libraries with outstanding websites:

Kansas City Public Library
Hennepin County Public Library
List of top public library websites as voted by PUBLIB and WEB4LIB listservs in 2007